Dynamical (e, 2e) studies of formic acid

Cross section data for electron scattering from DNA are important for modelling radiation damage in biological systems. Triply differential cross sections for the electron impact ionization of the highest occupied outer valence orbital of tetrahydrofurfuryl alcohol, which can be considered as an analogue to the deoxyribose backbone molecule in DNA, have been measured using the (e,2e) technique. The measurements have been performed with coplanar asymmetric kinematics at an incident electron energy of 250 eV, an ejected electron energy of 20 eV, and at scattered electron angles of −5 • , −10 • , and −15 • . Experimental results are compared with corresponding theoretical calculations performed using the molecular 3-body distorted wave model. Some important differences are observed between the experiment and calculations.

Section: Resultssupporting

confidence: 60%

Section: Resultsmentioning

confidence: 91%

Dynamical (e,2e) studies of tetrahydrofurfuryl alcohol

Bellm

Builth-Williams

Jones

et al. 2012

“…Indeed, this kinematical condition has been most interesting in terms of our earlier dynamical (e,2e) studies on large biomolecules. [8][9][10][11][12][13][14] …”

Section: Experimental Methodsmentioning

confidence: 99%

“…Such studies represent an important step in understanding how the structure of a species can influence the electron scattering phenomena. In this vein, we have recently extended some of our earlier studies on individual biomolecules [8][9][10][11][12][13][14] to chemically similar compounds in an attempt to further understand the role of structure and kinematics on the dynamics of electron-impact ionization. 15 Building on that work, we present a dynamical (e,2e) investigation to compare the electron-impact ionization process across a series of cyclic ethers: tetrahydrofuran (THF, C 4 H 8 O), tetrahydropyran (THP, C 5 H 10 O), and 1,4-dioxane (C 4 H 8 O 2 ).…”

Section: Introductionmentioning

confidence: 99%

A dynamical (e,2e) investigation of the structurally related cyclic ethers tetrahydrofuran, tetrahydropyran, and 1,4-dioxane

Builth-Williams¹,

Bellm²,

Chiari³

et al. 2013

Triple differential cross section measurements for the electron-impact ionization of the highest occupied molecular orbitals of tetrahydropyran and 1,4-dioxane are presented. For each molecule, experimental measurements were performed using the (e,2e) technique in asymmetric coplanar kinematics with an incident electron energy of 250 eV and an ejected electron energy of 20 eV. With the scattered electrons being detected at −5°, the angular distributions of the ejected electrons in the binary and recoil regions were observed. These measurements are compared with calculations performed within the molecular 3-body distorted wave model. Here, reasonable agreement was observed between the theoretical model and the experimental measurements. These measurements are compared with results from a recent study on tetrahydrofuran [D. B. Jones, J. D. Builth-Williams, S. M. Bellm, L. Chiari, C. G. Ning, H. Chaluvadi, B. Lohmann, O. Ingolfsson, D. Madison, and M. J. Brunger, Chem. Phys. Lett. 572, 32 (2013)] in order to evaluate the influence of structure on the dynamics of the ionization process across this series of cyclic ethers.

“…Indeed, while there has been an increased interest in these studies over the last decade, both theoretical and experimental studies have mostly been limited to smaller targets. Recently, molecules including methane 14,15 and formic acid 16 have been investigated. Studies concerning larger molecules such as component molecules of DNA and RNA are rare, and include tetrahydrofuran 17 and theoretical studies on thymine.…”

Section: Pyrimidine (C 4 H 4 N 2 )mentioning

confidence: 99%

Experimental and theoretical investigation of the triple differential cross section for electron impact ionization of pyrimidine molecules

Builth-Williams

Bellm

Jones

et al. 2012

Cross-section data for electron impact induced ionization of bio-molecules are important for modelling the deposition of energy within a biological medium and for gaining knowledge of electron driven processes at the molecular level. Triply differential cross sections have been measured for the electron impact ionization of the outer valence 7b2 and 10a1 orbitals of pyrimidine, using the (e, 2e) technique. The measurements have been performed with coplanar asymmetric kinematics, at an incident electron energy of 250 eV and ejected electron energy of 20 eV, for scattered electron angles of −5°, −10°, and −15°. The ejected electron angular range encompasses both the binary and recoil peaks in the triple differential cross section. Corresponding theoretical calculations have been performed using the molecular 3-body distorted wave model and are in reasonably good agreement with the present experiment.